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D-6 COMMUNICATIONS PROTOCOLS
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Table D-1. Some CCITT Digital Standards
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Name Title Equivalent
Standard(s)
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X.1 International user classes of service in public data networks ANSI X3.1; RS-269-B; FED-STD
1001; FIPS 22-1
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X.2 International user services and facilities in public networks INT-FED-STD 0001041
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X.4 General structure of signals of international alphabet no. 5 code for
data transmission over public data networks
CCITT V.4; ISO 1155; ANSI X3.15;
FED-STD 1010; FIPS 16-1
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X.20 Interface between data terminal equipment (DTE) and data circuit-
terminating equipment (DCE) for synchronous operation on public
data networks
None.
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X.20bis Use on public data networks of DTE which is designed for
interfacing to asynchronous duplex V.series modems
RS-232C
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X.21 Interface between DTE and DCE for circuit-switched synchronous
operation on public data networks
None.
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X.21bis Use on public data networks of DTE which is designed for
interfacing to synchronous duplex V.series modems
RS-232C; RS-449
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X.25 Interface between DTE and DCE for terminals operating in the
packet mode on the public data networks
INT-FED-STD 001041
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X.27 Electrical characteristics for balanced double-current interchange
circuits for general use with integrated circuit equipment in the field
of data communications
CCITT V.11; RS-422A; FED-STD
1020A
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X.28 DTE/DCE interface for a start-stop mode data terminal equipment
accessing packet assembly/disassembly facility (PAD) in a public
data network situated in the same country
None.
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X.29 Procedures for the exchange of control information and user data
between a packet assembly/disassembly facility (PAD) and a packet
mode DTE or another PAD
None.
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X.75 Terminal and transit call control procedures and data transfer system
on international circuits between packet-switched data networks
None.
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X.96 Call progress signals in public data networks INT-FED-STD 001041
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X.400 Defines the model for the overall message handling environment (for
OSI layers 4-7)
None.
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